Apparatus and method for scheduling data in cloud cell communication system

Abstract

A method for scheduling data by a new master Base Station (BS) in a cloud cell communication system is provided. The method includes detecting that a master BS for a specific Mobile Station (MS) is changed from an old master BS to a new master BS, before a tunnel which is established between the new master BS and an access gateway is activated, receiving MS data which the old master BS receives through the tunnel which is established between the old master BS and the access gateway and buffers from the old master BS, and scheduling the received MS data.

What is claimed is: 
     
         1 . A method for scheduling data by a new master Base Station (BS) in a cloud cell communication system, the method comprising:
 detecting that a master BS for a specific Mobile Station (MS) is changed from an old master BS to a new master BS;   before a tunnel which is established between the new master BS and an access gateway is activated, receiving MS data which the old master BS receives through the tunnel which is established between the old master BS and the access gateway and buffers from the old master BS; and   scheduling the received MS data.   
     
     
         2 . The method of  claim 1 , further comprising:
 before the tunnel which is established between the new master BS and the access gateway is activated, scheduling MS data buffered in the new master BS if scheduling for the MS data buffered in the old master BS is completed.   
     
     
         3 . The method of  claim 2 , further comprising:
 after the tunnel which is established between the new master BS and the access gateway is activated, receiving MS data from the access gateway; and   scheduling the MS data received from the access gateway.   
     
     
         4 . The method of  claim 2 , further comprising:
 transmitting scheduling control information for the MS data buffered in the old master BS to all cloud cell member BSs included in a cloud cell for the MS or a part of the cloud cell member BSs included in the cloud cell through a front haul link.   
     
     
         5 . The method of  claim 4 , wherein the part of the cloud cell member BSs included in the cloud cell is selected using various parameters including a reference signal measurement result received from the MS, and a load of a related cloud cell member BS. 
     
     
         6 . The method of  claim 1 , further comprising:
 if the scheduling of the MS data buffered in the old master BS is completed, scheduling MS data buffered in the new master BS regardless of whether the tunnel which is established between the new master BS and the access gateway is activated.   
     
     
         7 . The method of  claim 6 , further comprising:
 transmitting scheduling control information for the MS data buffered in the old master BS to all cloud cell member BSs included in a cloud cell for the MS or a part of the cloud cell member BSs included in the cloud cell through a front haul link.   
     
     
         8 . The method of  claim 7 , wherein the part of the cloud cell member BSs included in the cloud cell is selected using various parameters including a reference signal measurement result received from the MS, and a load of a related cloud cell member BS. 
     
     
         9 . The method of  claim 1 , further comprising:
 before the tunnel which is established between the new master BS and the access gateway is activated, detecting that there is no MS data buffered in the old master BS; and   transmitting a signal requesting activation for the tunnel which is established between the new master BS and the access gateway of the access gateway in order to receive MS data targeting the MS.   
     
     
         10 . The method of  claim 9 , wherein the transmitting of the signal requesting the activation for the tunnel which is established between the new master BS and the access gateway of the access gateway comprises transmitting a tunnel switch request message to the access gateway. 
     
     
         11 . The method of  claim 10 , wherein the MS data which the old master BS receives through the tunnel which is established between the old master BS and the access gateway and buffers comprises MS data which the old master BS receives from the access gateway after detecting that the master BS is changed and buffers. 
     
     
         12 . A method for scheduling data by an old master Base Station (BS) in a cloud cell communication system, the method comprising:
 detecting that a master BS for a specific Mobile Station (MS) is changed from an old master BS to a new master BS; and   before a tunnel which is established between the new master BS and an access gateway is activated, transmitting MS data which the old master BS receives through a tunnel which is established between the old master BS and the access gateway and buffers to the new master BS.   
     
     
         13 . The method of  claim 12 , wherein the MS data which the old master BS receives through the tunnel which is established between the old master BS and the access gateway and buffers comprises MS data which the old master BS receives from the access gateway after detecting that the master BS is changed and buffers. 
     
     
         14 . A method for transmitting/receiving data by a Mobile Station (MS) in a cloud cell communication system, the method comprising:
 detecting that a master Base Station (BS) for an MS is changed from an old master BS to a new master BS;   transmitting data to the new master BS; and   receiving data from the new master BS,   wherein the data which the MS transmits to the new master BS and receives from the new master BS comprises data which is generated by the new master BS, and the new master BS generates the data by scheduling MS data received through a tunnel which is established between the old master BS and an access gateway and buffered in the old master BS which the new master BS receives from the old master BS before a tunnel which is established between the new master BS and the access gateway is activated.   
     
     
         15 . The method of  claim 14 , wherein the data which the MS transmits to the new master BS and receives from the new master BS comprises data which is generated by the new master BS, and the new master BS generates the data by scheduling MS data buffered in the new master BS if scheduling of the MS data buffered in the old master BS is completed before the tunnel which is established between the new master BS and the access gateway is activated. 
     
     
         16 . The method of  claim 15 , wherein the data which the MS transmits to the new master BS and receives from the new master BS comprises data which is generated by the new master BS, and the new master BS generates the data by scheduling MS data received from the access gateway after the tunnel which is established between the new master BS and the access gateway is activated. 
     
     
         17 . A method for scheduling data by a new master Base Station (BS) in a cloud cell communication system, the method comprising:
 detecting that a master BS for a specific Mobile Station (MS) is changed from an old master BS to a new master BS;   detecting that a tunnel which is established between the new master BS and an access gateway is activated;   receiving MS data from the tunnel which is established between the new master BS and the access gateway; and   scheduling the received MS data.   
     
     
         18 . The method of  claim 17 , wherein the detecting that the tunnel which is established between the new master BS and the access gateway is activated comprises transmitting a signal requesting activation for the tunnel which is established between the new master BS and the access gateway of the access gateway in order to receive the MS data. 
     
     
         19 . The method of  claim 18 , wherein the transmitting of the signal requesting the activation for the tunnel which is established between the new master BS and the access gateway of the access gateway comprises transmitting a tunnel switch request message to the access gateway. 
     
     
         20 . A method for scheduling data by an old master Base Station (BS) in a cloud cell communication system, the method comprising:
 detecting that a master BS for a specific Mobile Station (MS) is changed from an old master BS to a new master BS; and   before a tunnel which is established between the new master BS and an access gateway is activated, scheduling MS data which the old master BS receives through a tunnel which is established between the old master BS and the access gateway and buffers to the new master BS.   
     
     
         21 . The method of  claim 20 , wherein the MS data which the old master BS receives through the tunnel which is established between the old master BS and the access gateway and buffers comprises MS data which the old master BS receives from the access gateway from a timing point at which the old master BS detects that the master BS is changed to a timing point until the tunnel which is established between the new master BS and the access gateway and buffers. 
     
     
         22 . A method for transmitting/receiving data by a Mobile Station (MS) in a cloud cell communication system, the method comprising:
 detecting that a master Base Station (BS) for an MS is changed from an old master BS to a new master BS;   transmitting data to the new master BS; and   receiving data from the new master BS,   wherein the data which the MS transmits to the new master BS and receives from the new master BS comprises data which is generated by the new master BS, and the new master BS generates the data by scheduling MS data received through a tunnel which is established between the new master BS and an access gateway after a tunnel which is established between the new master BS and the access gateway is activated.   
     
     
         23 . A method for scheduling data by an access gateway in a cloud cell communication system, the method comprising:
 receiving a signal requesting activation for a tunnel which is established between a new master Base Station (BS) and an access gateway from the new master BS; and   activating the tunnel which is established between the new master BS and the access gateway by switching a tunnel which is established between an old master BS and the access gateway to the tunnel which is established between the new master BS and the access gateway.   
     
     
         24 . The method of  claim 23 , wherein the receiving of the signal requesting activation for the tunnel which is established between the new master BS and the access gateway from the new master BS comprises receiving a tunnel switch request message from the new master BS. 
     
     
         25 . The method of  claim 23 , wherein the signal requesting activation for the tunnel which is established between the new master BS and the access gateway is transmitted by the new master BS in order that the new master BS may receive MS data targeting the MS according to detecting that there is no MS data buffered in the old master BS before the tunnel which is established between the new master BS and the access gateway is activated. 
     
     
         26 . A new master Base Station (BS) in a cloud cell communication system, the new master BS comprising:
 a controller configured to detect that a master BS for a specific Mobile Station (MS) is changed from an old master BS to a new master BS;   a receiver configured to receive MS data which the old master BS receives through a tunnel which is established between the old master BS and an access gateway and buffers from the old master BS before the tunnel which is established between the new master BS and the access gateway is activated,   wherein the controller schedules the received MS data.   
     
     
         27 . The new master BS of  claim 26 , wherein the controller is configured to schedule MS data buffered in the new master BS if scheduling for the MS data buffered in the old master BS is completed before the tunnel which is established between the new master BS and the access gateway is activated. 
     
     
         28 . The new master BS of  claim 27 , wherein the receiver is configured to receive MS data from the access gateway after the tunnel which is established between the new master BS and the access gateway is activated, and
 wherein the controller is configured to schedule the MS data received from the access gateway.   
     
     
         29 . The new master BS of  claim 27 , further comprising:
 a transmitter configured to transmit scheduling control information for the MS data buffered in the old master BS to all cloud cell member BSs included in a cloud cell for the MS or a part of the cloud cell member BSs included in the cloud cell through a front haul link.   
     
     
         30 . The new master BS of  claim 29 , wherein the part of the cloud cell member BSs included in the cloud cell is selected using various parameters including a reference signal measurement result received from the MS, and a load of a related cloud cell member BS. 
     
     
         31 . The new master BS of  claim 26 , wherein the controller is configured to schedule MS data buffered in the new master BS regardless of whether the tunnel which is established between the new master BS and the access gateway is activated if the scheduling of the MS data buffered in the old master BS is completed. 
     
     
         32 . The new master BS of  claim 31 , further comprising:
 a transmitter configured to transmit scheduling control information for the MS data buffered in the old master BS to all cloud cell member BSs included in a cloud cell for the MS or a part of the cloud cell member BSs included in the cloud cell through a front haul link.   
     
     
         33 . The new master BS of  claim 32 , wherein the part of the cloud cell member BSs included in the cloud cell is selected using various parameters including a reference signal measurement result received from the MS, and a load of a related cloud cell member BS. 
     
     
         34 . The new master BS of  claim 26 , further comprising:
 a transmitter,   wherein the controller is configured to detect that there is no MS data buffered in the old master BS before the tunnel which is established between the new master BS and the access gateway is activated, and   wherein the transmitter is configured to transmit a signal requesting activation for the tunnel which is established between the new master BS and the access gateway of the access gateway in order to receive MS data targeting the MS.   
     
     
         35 . The new master BS of  claim 34 , wherein the transmitter is configured to transmit a tunnel switch request message to the access gateway. 
     
     
         36 . The new master BS of  claim 35 , wherein the MS data which the old master BS receives through the tunnel which is established between the old master BS and the access gateway and buffers comprises MS data which the old master BS receives from the access gateway after detecting that the master BS is changed and buffers. 
     
     
         37 . An old master Base Station (BS) in a cloud cell communication system, the old master BS comprising:
 a controller configured to detect that a master BS for a specific Mobile Station (MS) is changed from an old master BS to a new master BS; and   a transmitter configured to transmit MS data which the old master BS receives through a tunnel which is established between the old master BS and an access gateway and buffers to the new master BS before a tunnel which is established between the new master BS and the access gateway is activated.   
     
     
         38 . The old master BS of  claim 37 , wherein the MS data which the old master BS receives through the tunnel which is established between the old master BS and the access gateway and buffers comprises MS data which the old master BS receives from the access gateway after detecting that the master BS is changed and buffers. 
     
     
         39 . A Mobile Station (MS) in a cloud cell communication system, the MS comprising:
 a controller configured to detect that a master Base Station (BS) for an MS is changed from an old master BS to a new master BS;   a transmitter configured to transmit data to the new master BS; and   a receiver configured to receive data from the new master BS,   wherein the data which the MS transmits to the new master BS and receives from the new master BS comprises data which is generated by the new master BS, and the new master BS generates the data by scheduling MS data received through a tunnel which is established between the old master BS and an access gateway and buffered in the old master BS which the new master BS receives from the old master BS before a tunnel which is established between the new master BS and the access gateway is activated.   
     
     
         40 . The MS of  claim 39 , wherein the data which the MS transmits to the new master BS and receives from the new master BS comprises data which is generated by the new master BS, and the new master BS generates the data by scheduling MS data buffered in the new master BS if scheduling of the MS data buffered in the old master BS is completed before the tunnel which is established between the new master BS and the access gateway is activated. 
     
     
         41 . The MS of  claim 40 , wherein the data which the MS transmits to the new master BS and receives from the new master BS comprises data which is generated by the new master BS, and the new master BS generates the data by scheduling MS data received from the access gateway after the tunnel which is established between the new master BS and the access gateway is activated. 
     
     
         42 . A new master Base Station (BS) in a cloud cell communication system, the new master BS comprising:
 a controller configured to detect that a master BS for a specific Mobile Station (MS) is changed from an old master BS to a new master BS and to detect that a tunnel which is established between the new master BS and an access gateway is activated; and   a receiver configured to receive MS data from the tunnel which is established between the new master BS and the access gateway,   wherein the controller schedules the received MS data.   
     
     
         43 . The new master BS of  claim 42 , further comprising:
 a transmitter configured to transmit a signal requesting activation for the tunnel which is established between the new master BS and the access gateway of the access gateway in order to receive the MS data.   
     
     
         44 . The new master BS of  claim 43 , wherein the transmitter is configured to transmit a tunnel switch request message to the access gateway. 
     
     
         45 . An old master Base Station (BS) in a cloud cell communication system, the old master BS comprising:
 a controller configured to detect that a master BS for a specific Mobile Station (MS) is changed from an old master BS to a new master BS and to schedule MS data which the old master BS receives through a tunnel which is established between the old master BS and an access gateway and buffers to the new master BS before a tunnel which is established between the new master BS and the access gateway is activated.   
     
     
         46 . The old master BS of  claim 45 , wherein the MS data which the old master BS receives through the tunnel which is established between the old master BS and the access gateway and buffers comprises MS data which the old master BS receives from the access gateway from a timing point at which the old master BS detects that the master BS is changed to a timing point until the tunnel which is established between the new master BS and the access gateway and buffers. 
     
     
         47 . A Mobile Station (MS) in a cloud cell communication system, the MS comprising:
 a controller configured to detect that a master Base Station (BS) for an MS is changed from an old master BS to a new master BS;   a transmitter configured to transmit data to the new master BS; and   a receiver is configured to receive data from the new master BS,   wherein the data which the MS transmits to the new master BS and receives from the new master BS comprises data which is generated by the new master BS, and the new master BS generates the data by scheduling MS data received through a tunnel which is established between the new master BS and an access gateway after a tunnel which is established between the new master BS and the access gateway is activated.   
     
     
         48 . An access gateway in a cloud cell communication system, the access gateway comprising:
 a receiver configured to receive a signal requesting activation for a tunnel which is established between a new master Base Station (BS) and an access gateway from the new master BS; and   a controller configured to activate the tunnel which is established between the new master BS and the access gateway by switching a tunnel which is established between an old master BS and the access gateway to the tunnel which is established between the new master BS and the access gateway.   
     
     
         49 . The access gateway of  claim 48 , wherein the receiver is configured to receive a tunnel switch request message from the new master BS. 
     
     
         50 . The access gateway of  claim 48 , wherein the signal requesting activation for the tunnel which is established between the new master BS and the access gateway is transmitted by the new master BS in order that the new master BS may receive MS data targeting the MS according to detecting that there is no MS data buffered in the old master BS before the tunnel which is established between the new master BS and the access gateway is activated.